The woman who created the osteopenia3.com website told me that she thought ankle weights helped her a lot. She started with light weights and would stand on leg, holding to something for security, and do various leg extensions, rotations and exercises with the other leg. Then switch legs. Over time she'd just use heavier weights. So she had the benefit of 'weight-bearing' for her legs without over-stressing on her back or lower back. She had osteoporosis 20 years ago, reversed it and still doesn't have it today. Her website is good in mentioning some known causes or triggers for bone loss. It's not up to date on all drug options but I found it helpful. And she was genuinely happy to hear that women are getting more proactive about preventing osteoporosis.

Oh, and she's not selling anything. Just shares her experience and journey.